With the Formats option in the Camera settings of your iOS device (e.g. iPhone) set to “High Efficiency”, certain edited image files will not be shown in ACDSee Photo Studio after being transferred via the ACDSee Mobile Sync app.

To work around this issue, please edit the filenames of these files and change the file extension from *.JPG to *.HEIC (e.g. from IMG_1000.JPG to IMG_1000.HEIC).

The photos will now display as ordinary HEIC files and can be viewed in Photo Studio.